2 Unix SMB/CIFS implementation.
3 process incoming packets - main loop
4 Copyright (C) Andrew Tridgell 1992-1998
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 struct timeval smb_last_time;
25 static char *InBuffer = NULL;
26 char *OutBuffer = NULL;
27 char *last_inbuf = NULL;
30 * Size of data we can send to client. Set
31 * by the client for all protocols above CORE.
32 * Set by us for CORE protocol.
34 int max_send = BUFFER_SIZE;
36 * Size of the data we can receive. Set by us.
37 * Can be modified by the max xmit parameter.
39 int max_recv = BUFFER_SIZE;
41 extern int last_message;
42 extern int global_oplock_break;
43 extern userdom_struct current_user_info;
44 extern int smb_read_error;
45 SIG_ATOMIC_T reload_after_sighup = 0;
46 SIG_ATOMIC_T got_sig_term = 0;
47 extern BOOL global_machine_password_needs_changing;
50 /****************************************************************************
51 structure to hold a linked list of queued messages.
53 ****************************************************************************/
59 } pending_message_list;
61 static ubi_slList smb_oplock_queue = { NULL, (ubi_slNodePtr)&smb_oplock_queue, 0};
63 /****************************************************************************
64 Function to push a message onto the tail of a linked list of smb messages ready
66 ****************************************************************************/
68 static BOOL push_message(ubi_slList *list_head, char *buf, int msg_len)
70 pending_message_list *msg = (pending_message_list *)
71 malloc(sizeof(pending_message_list));
75 DEBUG(0,("push_message: malloc fail (1)\n"));
79 msg->msg_buf = (char *)malloc(msg_len);
80 if(msg->msg_buf == NULL)
82 DEBUG(0,("push_message: malloc fail (2)\n"));
87 memcpy(msg->msg_buf, buf, msg_len);
88 msg->msg_len = msg_len;
90 ubi_slAddTail( list_head, msg);
95 /****************************************************************************
96 Function to push a smb message onto a linked list of local smb messages ready
98 ****************************************************************************/
100 BOOL push_oplock_pending_smb_message(char *buf, int msg_len)
102 return push_message(&smb_oplock_queue, buf, msg_len);
105 /****************************************************************************
106 Do all async processing in here. This includes UDB oplock messages, kernel
107 oplock messages, change notify events etc.
108 ****************************************************************************/
110 static void async_processing(char *buffer, int buffer_len)
112 DEBUG(10,("async_processing: Doing async processing.\n"));
114 /* check for oplock messages (both UDP and kernel) */
115 if (receive_local_message(buffer, buffer_len, 1)) {
116 process_local_message(buffer, buffer_len);
120 exit_server("Caught TERM signal");
123 /* check for async change notify events */
124 process_pending_change_notify_queue(0);
126 /* check for sighup processing */
127 if (reload_after_sighup) {
128 change_to_root_user();
129 DEBUG(1,("Reloading services after SIGHUP\n"));
130 reload_services(False);
131 reload_after_sighup = 0;
135 /****************************************************************************
136 Do a select on an two fd's - with timeout.
138 If a local udp message has been pushed onto the
139 queue (this can only happen during oplock break
140 processing) call async_processing()
142 If a pending smb message has been pushed onto the
143 queue (this can only happen during oplock break
144 processing) return this next.
146 If the first smbfd is ready then read an smb from it.
147 if the second (loopback UDP) fd is ready then read a message
148 from it and setup the buffer header to identify the length
150 Returns False on timeout or error.
153 The timeout is in milliseconds
154 ****************************************************************************/
156 static BOOL receive_message_or_smb(char *buffer, int buffer_len, int timeout)
168 * Note that this call must be before processing any SMB
169 * messages as we need to synchronously process any messages
170 * we may have sent to ourselves from the previous SMB.
175 * Check to see if we already have a message on the smb queue.
176 * If so - copy and return it.
178 if(ubi_slCount(&smb_oplock_queue) != 0) {
179 pending_message_list *msg = (pending_message_list *)ubi_slRemHead(&smb_oplock_queue);
180 memcpy(buffer, msg->msg_buf, MIN(buffer_len, msg->msg_len));
182 /* Free the message we just copied. */
183 SAFE_FREE(msg->msg_buf);
186 DEBUG(5,("receive_message_or_smb: returning queued smb message.\n"));
192 * Setup the select read fd set.
198 * Ensure we process oplock break messages by preference.
199 * We have to do this before the select, after the select
200 * and if the select returns EINTR. This is due to the fact
201 * that the selects called from async_processing can eat an EINTR
202 * caused by a signal (we can't take the break message there).
203 * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
206 if (oplock_message_waiting(&fds)) {
207 DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
208 async_processing(buffer, buffer_len);
210 * After async processing we must go and do the select again, as
211 * the state of the flag in fds for the server file descriptor is
212 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
217 FD_SET(smbd_server_fd(),&fds);
218 maxfd = setup_oplock_select_set(&fds);
220 to.tv_sec = timeout / 1000;
221 to.tv_usec = (timeout % 1000) * 1000;
223 selrtn = sys_select(MAX(maxfd,smbd_server_fd())+1,&fds,NULL,NULL,timeout>0?&to:NULL);
225 /* if we get EINTR then maybe we have received an oplock
226 signal - treat this as select returning 1. This is ugly, but
227 is the best we can do until the oplock code knows more about
229 if (selrtn == -1 && errno == EINTR) {
230 async_processing(buffer, buffer_len);
232 * After async processing we must go and do the select again, as
233 * the state of the flag in fds for the server file descriptor is
234 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
241 /* something is wrong. Maybe the socket is dead? */
242 smb_read_error = READ_ERROR;
246 /* Did we timeout ? */
248 smb_read_error = READ_TIMEOUT;
253 * Ensure we process oplock break messages by preference.
254 * This is IMPORTANT ! Otherwise we can starve other processes
255 * sending us an oplock break message. JRA.
258 if (oplock_message_waiting(&fds)) {
259 async_processing(buffer, buffer_len);
261 * After async processing we must go and do the select again, as
262 * the state of the flag in fds for the server file descriptor is
263 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
268 return receive_smb(smbd_server_fd(), buffer, 0);
271 /****************************************************************************
272 Get the next SMB packet, doing the local message processing automatically.
273 ****************************************************************************/
275 BOOL receive_next_smb(char *inbuf, int bufsize, int timeout)
281 ret = receive_message_or_smb(inbuf,bufsize,timeout);
283 got_keepalive = (ret && (CVAL(inbuf,0) == SMBkeepalive));
284 } while (ret && got_keepalive);
289 /****************************************************************************
290 We're terminating and have closed all our files/connections etc.
291 If there are any pending local messages we need to respond to them
292 before termination so that other smbds don't think we just died whilst
294 ****************************************************************************/
296 void respond_to_all_remaining_local_messages(void)
301 * Assert we have no exclusive open oplocks.
304 if(get_number_of_exclusive_open_oplocks()) {
305 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
306 get_number_of_exclusive_open_oplocks() ));
311 * Keep doing receive_local_message with a 1 ms timeout until
312 * we have no more messages.
314 while(receive_local_message(buffer, sizeof(buffer), 1)) {
315 /* Deal with oplock break requests from other smbd's. */
316 process_local_message(buffer, sizeof(buffer));
324 These flags determine some of the permissions required to do an operation
326 Note that I don't set NEED_WRITE on some write operations because they
327 are used by some brain-dead clients when printing, and I don't want to
328 force write permissions on print services.
330 #define AS_USER (1<<0)
331 #define NEED_WRITE (1<<1)
332 #define TIME_INIT (1<<2)
333 #define CAN_IPC (1<<3)
334 #define AS_GUEST (1<<5)
335 #define QUEUE_IN_OPLOCK (1<<6)
338 define a list of possible SMB messages and their corresponding
339 functions. Any message that has a NULL function is unimplemented -
340 please feel free to contribute implementations!
342 const static struct smb_message_struct
345 int (*fn)(connection_struct *conn, char *, char *, int, int);
348 smb_messages[256] = {
350 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
351 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
352 /* 0x02 */ { "SMBopen",reply_open,AS_USER | QUEUE_IN_OPLOCK },
353 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
354 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
355 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
356 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
357 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
358 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
359 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
360 /* 0x0a */ { "SMBread",reply_read,AS_USER},
361 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
362 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
363 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
364 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER | QUEUE_IN_OPLOCK },
365 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
366 /* 0x10 */ { "SMBchkpth",reply_chkpth,AS_USER},
367 /* 0x11 */ { "SMBexit",reply_exit,0},
368 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
369 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
370 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
371 /* 0x15 */ { NULL, NULL, 0 },
372 /* 0x16 */ { NULL, NULL, 0 },
373 /* 0x17 */ { NULL, NULL, 0 },
374 /* 0x18 */ { NULL, NULL, 0 },
375 /* 0x19 */ { NULL, NULL, 0 },
376 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
377 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
378 /* 0x1c */ { "SMBreadBs",NULL,0 },
379 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
380 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
381 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
382 /* 0x20 */ { "SMBwritec",NULL,0},
383 /* 0x21 */ { NULL, NULL, 0 },
384 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
385 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
386 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
387 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC },
388 /* 0x26 */ { "SMBtranss",NULL,AS_USER | CAN_IPC},
389 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
390 /* 0x28 */ { "SMBioctls",NULL,AS_USER},
391 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
392 /* 0x2a */ { "SMBmove",NULL,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
393 /* 0x2b */ { "SMBecho",reply_echo,0},
394 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
395 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
396 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
397 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
398 /* 0x30 */ { NULL, NULL, 0 },
399 /* 0x31 */ { NULL, NULL, 0 },
400 /* 0x32 */ { "SMBtrans2", reply_trans2, AS_USER | CAN_IPC },
401 /* 0x33 */ { "SMBtranss2", reply_transs2, AS_USER},
402 /* 0x34 */ { "SMBfindclose", reply_findclose,AS_USER},
403 /* 0x35 */ { "SMBfindnclose", reply_findnclose, AS_USER},
404 /* 0x36 */ { NULL, NULL, 0 },
405 /* 0x37 */ { NULL, NULL, 0 },
406 /* 0x38 */ { NULL, NULL, 0 },
407 /* 0x39 */ { NULL, NULL, 0 },
408 /* 0x3a */ { NULL, NULL, 0 },
409 /* 0x3b */ { NULL, NULL, 0 },
410 /* 0x3c */ { NULL, NULL, 0 },
411 /* 0x3d */ { NULL, NULL, 0 },
412 /* 0x3e */ { NULL, NULL, 0 },
413 /* 0x3f */ { NULL, NULL, 0 },
414 /* 0x40 */ { NULL, NULL, 0 },
415 /* 0x41 */ { NULL, NULL, 0 },
416 /* 0x42 */ { NULL, NULL, 0 },
417 /* 0x43 */ { NULL, NULL, 0 },
418 /* 0x44 */ { NULL, NULL, 0 },
419 /* 0x45 */ { NULL, NULL, 0 },
420 /* 0x46 */ { NULL, NULL, 0 },
421 /* 0x47 */ { NULL, NULL, 0 },
422 /* 0x48 */ { NULL, NULL, 0 },
423 /* 0x49 */ { NULL, NULL, 0 },
424 /* 0x4a */ { NULL, NULL, 0 },
425 /* 0x4b */ { NULL, NULL, 0 },
426 /* 0x4c */ { NULL, NULL, 0 },
427 /* 0x4d */ { NULL, NULL, 0 },
428 /* 0x4e */ { NULL, NULL, 0 },
429 /* 0x4f */ { NULL, NULL, 0 },
430 /* 0x50 */ { NULL, NULL, 0 },
431 /* 0x51 */ { NULL, NULL, 0 },
432 /* 0x52 */ { NULL, NULL, 0 },
433 /* 0x53 */ { NULL, NULL, 0 },
434 /* 0x54 */ { NULL, NULL, 0 },
435 /* 0x55 */ { NULL, NULL, 0 },
436 /* 0x56 */ { NULL, NULL, 0 },
437 /* 0x57 */ { NULL, NULL, 0 },
438 /* 0x58 */ { NULL, NULL, 0 },
439 /* 0x59 */ { NULL, NULL, 0 },
440 /* 0x5a */ { NULL, NULL, 0 },
441 /* 0x5b */ { NULL, NULL, 0 },
442 /* 0x5c */ { NULL, NULL, 0 },
443 /* 0x5d */ { NULL, NULL, 0 },
444 /* 0x5e */ { NULL, NULL, 0 },
445 /* 0x5f */ { NULL, NULL, 0 },
446 /* 0x60 */ { NULL, NULL, 0 },
447 /* 0x61 */ { NULL, NULL, 0 },
448 /* 0x62 */ { NULL, NULL, 0 },
449 /* 0x63 */ { NULL, NULL, 0 },
450 /* 0x64 */ { NULL, NULL, 0 },
451 /* 0x65 */ { NULL, NULL, 0 },
452 /* 0x66 */ { NULL, NULL, 0 },
453 /* 0x67 */ { NULL, NULL, 0 },
454 /* 0x68 */ { NULL, NULL, 0 },
455 /* 0x69 */ { NULL, NULL, 0 },
456 /* 0x6a */ { NULL, NULL, 0 },
457 /* 0x6b */ { NULL, NULL, 0 },
458 /* 0x6c */ { NULL, NULL, 0 },
459 /* 0x6d */ { NULL, NULL, 0 },
460 /* 0x6e */ { NULL, NULL, 0 },
461 /* 0x6f */ { NULL, NULL, 0 },
462 /* 0x70 */ { "SMBtcon",reply_tcon,0},
463 /* 0x71 */ { "SMBtdis",reply_tdis,0},
464 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
465 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
466 /* 0x74 */ { "SMBulogoffX", reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
467 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
468 /* 0x76 */ { NULL, NULL, 0 },
469 /* 0x77 */ { NULL, NULL, 0 },
470 /* 0x78 */ { NULL, NULL, 0 },
471 /* 0x79 */ { NULL, NULL, 0 },
472 /* 0x7a */ { NULL, NULL, 0 },
473 /* 0x7b */ { NULL, NULL, 0 },
474 /* 0x7c */ { NULL, NULL, 0 },
475 /* 0x7d */ { NULL, NULL, 0 },
476 /* 0x7e */ { NULL, NULL, 0 },
477 /* 0x7f */ { NULL, NULL, 0 },
478 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
479 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
480 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
481 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
482 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
483 /* 0x85 */ { NULL, NULL, 0 },
484 /* 0x86 */ { NULL, NULL, 0 },
485 /* 0x87 */ { NULL, NULL, 0 },
486 /* 0x88 */ { NULL, NULL, 0 },
487 /* 0x89 */ { NULL, NULL, 0 },
488 /* 0x8a */ { NULL, NULL, 0 },
489 /* 0x8b */ { NULL, NULL, 0 },
490 /* 0x8c */ { NULL, NULL, 0 },
491 /* 0x8d */ { NULL, NULL, 0 },
492 /* 0x8e */ { NULL, NULL, 0 },
493 /* 0x8f */ { NULL, NULL, 0 },
494 /* 0x90 */ { NULL, NULL, 0 },
495 /* 0x91 */ { NULL, NULL, 0 },
496 /* 0x92 */ { NULL, NULL, 0 },
497 /* 0x93 */ { NULL, NULL, 0 },
498 /* 0x94 */ { NULL, NULL, 0 },
499 /* 0x95 */ { NULL, NULL, 0 },
500 /* 0x96 */ { NULL, NULL, 0 },
501 /* 0x97 */ { NULL, NULL, 0 },
502 /* 0x98 */ { NULL, NULL, 0 },
503 /* 0x99 */ { NULL, NULL, 0 },
504 /* 0x9a */ { NULL, NULL, 0 },
505 /* 0x9b */ { NULL, NULL, 0 },
506 /* 0x9c */ { NULL, NULL, 0 },
507 /* 0x9d */ { NULL, NULL, 0 },
508 /* 0x9e */ { NULL, NULL, 0 },
509 /* 0x9f */ { NULL, NULL, 0 },
510 /* 0xa0 */ { "SMBnttrans", reply_nttrans, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
511 /* 0xa1 */ { "SMBnttranss", reply_nttranss, AS_USER | CAN_IPC },
512 /* 0xa2 */ { "SMBntcreateX", reply_ntcreate_and_X, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
513 /* 0xa3 */ { NULL, NULL, 0 },
514 /* 0xa4 */ { "SMBntcancel", reply_ntcancel, 0 },
515 /* 0xa5 */ { NULL, NULL, 0 },
516 /* 0xa6 */ { NULL, NULL, 0 },
517 /* 0xa7 */ { NULL, NULL, 0 },
518 /* 0xa8 */ { NULL, NULL, 0 },
519 /* 0xa9 */ { NULL, NULL, 0 },
520 /* 0xaa */ { NULL, NULL, 0 },
521 /* 0xab */ { NULL, NULL, 0 },
522 /* 0xac */ { NULL, NULL, 0 },
523 /* 0xad */ { NULL, NULL, 0 },
524 /* 0xae */ { NULL, NULL, 0 },
525 /* 0xaf */ { NULL, NULL, 0 },
526 /* 0xb0 */ { NULL, NULL, 0 },
527 /* 0xb1 */ { NULL, NULL, 0 },
528 /* 0xb2 */ { NULL, NULL, 0 },
529 /* 0xb3 */ { NULL, NULL, 0 },
530 /* 0xb4 */ { NULL, NULL, 0 },
531 /* 0xb5 */ { NULL, NULL, 0 },
532 /* 0xb6 */ { NULL, NULL, 0 },
533 /* 0xb7 */ { NULL, NULL, 0 },
534 /* 0xb8 */ { NULL, NULL, 0 },
535 /* 0xb9 */ { NULL, NULL, 0 },
536 /* 0xba */ { NULL, NULL, 0 },
537 /* 0xbb */ { NULL, NULL, 0 },
538 /* 0xbc */ { NULL, NULL, 0 },
539 /* 0xbd */ { NULL, NULL, 0 },
540 /* 0xbe */ { NULL, NULL, 0 },
541 /* 0xbf */ { NULL, NULL, 0 },
542 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER | QUEUE_IN_OPLOCK },
543 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
544 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
545 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
546 /* 0xc4 */ { NULL, NULL, 0 },
547 /* 0xc5 */ { NULL, NULL, 0 },
548 /* 0xc6 */ { NULL, NULL, 0 },
549 /* 0xc7 */ { NULL, NULL, 0 },
550 /* 0xc8 */ { NULL, NULL, 0 },
551 /* 0xc9 */ { NULL, NULL, 0 },
552 /* 0xca */ { NULL, NULL, 0 },
553 /* 0xcb */ { NULL, NULL, 0 },
554 /* 0xcc */ { NULL, NULL, 0 },
555 /* 0xcd */ { NULL, NULL, 0 },
556 /* 0xce */ { NULL, NULL, 0 },
557 /* 0xcf */ { NULL, NULL, 0 },
558 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
559 /* 0xd1 */ { "SMBsendb",NULL,AS_GUEST},
560 /* 0xd2 */ { "SMBfwdname",NULL,AS_GUEST},
561 /* 0xd3 */ { "SMBcancelf",NULL,AS_GUEST},
562 /* 0xd4 */ { "SMBgetmac",NULL,AS_GUEST},
563 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
564 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
565 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
566 /* 0xd8 */ { NULL, NULL, 0 },
567 /* 0xd9 */ { NULL, NULL, 0 },
568 /* 0xda */ { NULL, NULL, 0 },
569 /* 0xdb */ { NULL, NULL, 0 },
570 /* 0xdc */ { NULL, NULL, 0 },
571 /* 0xdd */ { NULL, NULL, 0 },
572 /* 0xde */ { NULL, NULL, 0 },
573 /* 0xdf */ { NULL, NULL, 0 },
574 /* 0xe0 */ { NULL, NULL, 0 },
575 /* 0xe1 */ { NULL, NULL, 0 },
576 /* 0xe2 */ { NULL, NULL, 0 },
577 /* 0xe3 */ { NULL, NULL, 0 },
578 /* 0xe4 */ { NULL, NULL, 0 },
579 /* 0xe5 */ { NULL, NULL, 0 },
580 /* 0xe6 */ { NULL, NULL, 0 },
581 /* 0xe7 */ { NULL, NULL, 0 },
582 /* 0xe8 */ { NULL, NULL, 0 },
583 /* 0xe9 */ { NULL, NULL, 0 },
584 /* 0xea */ { NULL, NULL, 0 },
585 /* 0xeb */ { NULL, NULL, 0 },
586 /* 0xec */ { NULL, NULL, 0 },
587 /* 0xed */ { NULL, NULL, 0 },
588 /* 0xee */ { NULL, NULL, 0 },
589 /* 0xef */ { NULL, NULL, 0 },
590 /* 0xf0 */ { NULL, NULL, 0 },
591 /* 0xf1 */ { NULL, NULL, 0 },
592 /* 0xf2 */ { NULL, NULL, 0 },
593 /* 0xf3 */ { NULL, NULL, 0 },
594 /* 0xf4 */ { NULL, NULL, 0 },
595 /* 0xf5 */ { NULL, NULL, 0 },
596 /* 0xf6 */ { NULL, NULL, 0 },
597 /* 0xf7 */ { NULL, NULL, 0 },
598 /* 0xf8 */ { NULL, NULL, 0 },
599 /* 0xf9 */ { NULL, NULL, 0 },
600 /* 0xfa */ { NULL, NULL, 0 },
601 /* 0xfb */ { NULL, NULL, 0 },
602 /* 0xfc */ { NULL, NULL, 0 },
603 /* 0xfd */ { NULL, NULL, 0 },
604 /* 0xfe */ { NULL, NULL, 0 },
605 /* 0xff */ { NULL, NULL, 0 }
609 /*******************************************************************
610 Dump a packet to a file.
611 ********************************************************************/
613 static void smb_dump(const char *name, int type, char *data, ssize_t len)
617 if (DEBUGLEVEL < 50) return;
619 if (len < 4) len = smb_len(data)+4;
620 for (i=1;i<100;i++) {
621 slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.%s", name, i,
622 type ? "req" : "resp");
623 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
624 if (fd != -1 || errno != EEXIST) break;
627 ssize_t ret = write(fd, data, len);
629 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
631 DEBUG(0,("created %s len %d\n", fname, len));
636 /****************************************************************************
637 Do a switch on the message type, and return the response size
638 ****************************************************************************/
640 static int switch_message(int type,char *inbuf,char *outbuf,int size,int bufsize)
642 static pid_t pid= (pid_t)-1;
644 extern uint16 global_smbpid;
648 if (pid == (pid_t)-1)
654 /* Make sure this is an SMB packet. smb_size contains NetBIOS header so subtract 4 from it. */
655 if ((strncmp(smb_base(inbuf),"\377SMB",4) != 0) || (size < (smb_size - 4))) {
656 DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",smb_len(inbuf)));
657 exit_server("Non-SMB packet");
661 /* yuck! this is an interim measure before we get rid of our
662 current inbuf/outbuf system */
663 global_smbpid = SVAL(inbuf,smb_pid);
665 if (smb_messages[type].fn == NULL) {
666 DEBUG(0,("Unknown message type %d!\n",type));
667 smb_dump("Unknown", 1, inbuf, size);
668 outsize = reply_unknown(inbuf,outbuf);
670 int flags = smb_messages[type].flags;
671 static uint16 last_session_tag = UID_FIELD_INVALID;
672 /* In share mode security we must ignore the vuid. */
673 uint16 session_tag = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(inbuf,smb_uid);
674 connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
676 DEBUG(3,("switch message %s (pid %d)\n",smb_fn_name(type),(int)pid));
678 smb_dump(smb_fn_name(type), 1, inbuf, size);
679 if(global_oplock_break) {
680 if(flags & QUEUE_IN_OPLOCK) {
682 * Queue this message as we are the process of an oplock break.
685 DEBUG( 2, ( "switch_message: queueing message due to being in " ) );
686 DEBUGADD( 2, ( "oplock break state.\n" ) );
688 push_oplock_pending_smb_message( inbuf, size );
693 /* Ensure this value is replaced in the incoming packet. */
694 SSVAL(inbuf,smb_uid,session_tag);
697 * Ensure the correct username is in current_user_info.
698 * This is a really ugly bugfix for problems with
699 * multiple session_setup_and_X's being done and
700 * allowing %U and %G substitutions to work correctly.
701 * There is a reason this code is done here, don't
702 * move it unless you know what you're doing... :-).
706 if (session_tag != last_session_tag) {
707 user_struct *vuser = NULL;
709 last_session_tag = session_tag;
710 if(session_tag != UID_FIELD_INVALID)
711 vuser = get_valid_user_struct(session_tag);
713 current_user_info = vuser->user;
716 /* does this protocol need to be run as root? */
717 if (!(flags & AS_USER))
718 change_to_root_user();
720 /* does this protocol need a valid tree connection? */
721 if ((flags & AS_USER) && !conn)
722 return ERROR_DOS(ERRSRV, ERRinvnid);
725 /* does this protocol need to be run as the connected user? */
726 if ((flags & AS_USER) && !change_to_user(conn,session_tag)) {
727 if (flags & AS_GUEST)
730 return(ERROR_DOS(ERRSRV,ERRaccess));
733 /* this code is to work around a bug is MS client 3 without
734 introducing a security hole - it needs to be able to do
735 print queue checks as guest if it isn't logged in properly */
739 /* does it need write permission? */
740 if ((flags & NEED_WRITE) && !CAN_WRITE(conn))
741 return(ERROR_DOS(ERRSRV,ERRaccess));
743 /* ipc services are limited */
744 if (IS_IPC(conn) && (flags & AS_USER) && !(flags & CAN_IPC))
745 return(ERROR_DOS(ERRSRV,ERRaccess));
747 /* load service specific parameters */
748 if (conn && !set_current_service(conn,(flags & AS_USER)?True:False))
749 return(ERROR_DOS(ERRSRV,ERRaccess));
751 /* does this protocol need to be run as guest? */
752 if ((flags & AS_GUEST) && (!change_to_guest() ||
753 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))))
754 return(ERROR_DOS(ERRSRV,ERRaccess));
758 outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
761 smb_dump(smb_fn_name(type), 0, outbuf, outsize);
767 /****************************************************************************
768 Construct a reply to the incoming packet.
769 ****************************************************************************/
771 static int construct_reply(char *inbuf,char *outbuf,int size,int bufsize)
773 int type = CVAL(inbuf,smb_com);
775 int msg_type = CVAL(inbuf,0);
777 GetTimeOfDay(&smb_last_time);
784 return(reply_special(inbuf,outbuf));
786 construct_reply_common(inbuf, outbuf);
788 outsize = switch_message(type,inbuf,outbuf,size,bufsize);
790 outsize += chain_size;
793 smb_setlen(outbuf,outsize - 4);
797 /****************************************************************************
798 Keep track of the number of running smbd's. This functionality is used to
799 'hard' limit Samba overhead on resource constrained systems.
800 ****************************************************************************/
802 static BOOL smbd_process_limit(void)
806 if (lp_max_smbd_processes()) {
808 /* Always add one to the smbd process count, as exit_server() always
812 total_smbds = 1; /* In case we need to create the entry. */
814 if (!conn_tdb_ctx()) {
815 DEBUG(0,("smbd_process_limit: max smbd processes parameter set with status parameter not \
816 set. Ignoring max smbd restriction.\n"));
820 if (tdb_change_int32_atomic(conn_tdb_ctx(), "INFO/total_smbds", &total_smbds, 1) == -1)
823 return total_smbds > lp_max_smbd_processes();
829 /****************************************************************************
830 process an smb from the client - split out from the smbd_process() code so
831 it can be used by the oplock break code.
832 ****************************************************************************/
833 void process_smb(char *inbuf, char *outbuf)
835 static int trans_num;
836 int msg_type = CVAL(inbuf,0);
837 int32 len = smb_len(inbuf);
840 DO_PROFILE_INC(smb_count);
842 if (trans_num == 0) {
843 /* on the first packet, check the global hosts allow/ hosts
844 deny parameters before doing any parsing of the packet
845 passed to us by the client. This prevents attacks on our
846 parsing code from hosts not in the hosts allow list */
847 if (smbd_process_limit() ||
848 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))) {
849 /* send a negative session response "not listening on calling
851 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
852 DEBUG( 1, ( "Connection denied from %s\n",
854 (void)send_smb(smbd_server_fd(),(char *)buf);
855 exit_server("connection denied");
859 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type, len ) );
860 DEBUG( 3, ( "Transaction %d of length %d\n", trans_num, nread ) );
864 else if(msg_type == SMBkeepalive)
865 return; /* Keepalive packet. */
867 nread = construct_reply(inbuf,outbuf,nread,max_send);
871 if (CVAL(outbuf,0) == 0)
874 if (nread != smb_len(outbuf) + 4)
876 DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
877 nread, smb_len(outbuf)));
880 if (!send_smb(smbd_server_fd(),outbuf))
881 exit_server("process_smb: send_smb failed.");
888 /****************************************************************************
889 return a string containing the function name of a SMB command
890 ****************************************************************************/
891 const char *smb_fn_name(int type)
893 static char *unknown_name = "SMBunknown";
895 if (smb_messages[type].name == NULL)
896 return(unknown_name);
898 return(smb_messages[type].name);
902 /****************************************************************************
903 Helper function for contruct_reply.
904 ****************************************************************************/
906 void construct_reply_common(char *inbuf,char *outbuf)
908 memset(outbuf,'\0',smb_size);
910 set_message(outbuf,0,0,True);
911 SCVAL(outbuf,smb_com,CVAL(inbuf,smb_com));
913 memcpy(outbuf+4,inbuf+4,4);
914 SCVAL(outbuf,smb_rcls,SMB_SUCCESS);
915 SCVAL(outbuf,smb_reh,0);
916 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
917 SSVAL(outbuf,smb_flg2,
918 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
919 FLAGS2_LONG_PATH_COMPONENTS |
920 FLAGS2_32_BIT_ERROR_CODES | FLAGS2_EXTENDED_SECURITY);
922 SSVAL(outbuf,smb_err,SMB_SUCCESS);
923 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
924 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
925 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
926 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
929 /****************************************************************************
930 construct a chained reply and add it to the already made reply
931 **************************************************************************/
932 int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
934 static char *orig_inbuf;
935 static char *orig_outbuf;
936 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
937 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
938 char *inbuf2, *outbuf2;
940 char inbuf_saved[smb_wct];
941 char outbuf_saved[smb_wct];
942 int wct = CVAL(outbuf,smb_wct);
943 int outsize = smb_size + 2*wct + SVAL(outbuf,smb_vwv0+2*wct);
945 /* maybe its not chained */
946 if (smb_com2 == 0xFF) {
947 SCVAL(outbuf,smb_vwv0,0xFF);
951 if (chain_size == 0) {
952 /* this is the first part of the chain */
954 orig_outbuf = outbuf;
958 * The original Win95 redirector dies on a reply to
959 * a lockingX and read chain unless the chain reply is
960 * 4 byte aligned. JRA.
963 outsize = (outsize + 3) & ~3;
965 /* we need to tell the client where the next part of the reply will be */
966 SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
967 SCVAL(outbuf,smb_vwv0,smb_com2);
969 /* remember how much the caller added to the chain, only counting stuff
970 after the parameter words */
971 chain_size += outsize - smb_wct;
973 /* work out pointers into the original packets. The
974 headers on these need to be filled in */
975 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
976 outbuf2 = orig_outbuf + SVAL(outbuf,smb_vwv1) + 4 - smb_wct;
978 /* remember the original command type */
979 smb_com1 = CVAL(orig_inbuf,smb_com);
981 /* save the data which will be overwritten by the new headers */
982 memcpy(inbuf_saved,inbuf2,smb_wct);
983 memcpy(outbuf_saved,outbuf2,smb_wct);
985 /* give the new packet the same header as the last part of the SMB */
986 memmove(inbuf2,inbuf,smb_wct);
988 /* create the in buffer */
989 SCVAL(inbuf2,smb_com,smb_com2);
991 /* create the out buffer */
992 construct_reply_common(inbuf2, outbuf2);
994 DEBUG(3,("Chained message\n"));
997 /* process the request */
998 outsize2 = switch_message(smb_com2,inbuf2,outbuf2,size-chain_size,
1001 /* copy the new reply and request headers over the old ones, but
1002 preserve the smb_com field */
1003 memmove(orig_outbuf,outbuf2,smb_wct);
1004 SCVAL(orig_outbuf,smb_com,smb_com1);
1006 /* restore the saved data, being careful not to overwrite any
1007 data from the reply header */
1008 memcpy(inbuf2,inbuf_saved,smb_wct);
1010 int ofs = smb_wct - PTR_DIFF(outbuf2,orig_outbuf);
1011 if (ofs < 0) ofs = 0;
1012 memmove(outbuf2+ofs,outbuf_saved+ofs,smb_wct-ofs);
1018 /****************************************************************************
1019 Setup the needed select timeout.
1020 ****************************************************************************/
1022 static int setup_select_timeout(void)
1027 select_timeout = blocking_locks_timeout(SMBD_SELECT_TIMEOUT);
1028 select_timeout *= 1000;
1030 t = change_notify_timeout();
1032 select_timeout = MIN(select_timeout, t*1000);
1034 if (print_notify_messages_pending())
1035 select_timeout = MIN(select_timeout, 1000);
1037 return select_timeout;
1040 /****************************************************************************
1041 Check if services need reloading.
1042 ****************************************************************************/
1044 void check_reload(int t)
1046 static time_t last_smb_conf_reload_time = 0;
1048 if(last_smb_conf_reload_time == 0)
1049 last_smb_conf_reload_time = t;
1051 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK))
1053 reload_services(True);
1054 reload_after_sighup = False;
1055 last_smb_conf_reload_time = t;
1059 /****************************************************************************
1060 Process any timeout housekeeping. Return False if the caller should exit.
1061 ****************************************************************************/
1063 static BOOL timeout_processing(int deadtime, int *select_timeout, time_t *last_timeout_processing_time)
1065 static time_t last_keepalive_sent_time = 0;
1066 static time_t last_idle_closed_check = 0;
1068 BOOL allidle = True;
1069 extern int keepalive;
1071 if (smb_read_error == READ_EOF)
1073 DEBUG(3,("end of file from client\n"));
1077 if (smb_read_error == READ_ERROR)
1079 DEBUG(3,("receive_smb error (%s) exiting\n",
1084 *last_timeout_processing_time = t = time(NULL);
1086 if(last_keepalive_sent_time == 0)
1087 last_keepalive_sent_time = t;
1089 if(last_idle_closed_check == 0)
1090 last_idle_closed_check = t;
1092 /* become root again if waiting */
1093 change_to_root_user();
1095 /* check if we need to reload services */
1098 /* automatic timeout if all connections are closed */
1099 if (conn_num_open()==0 && (t - last_idle_closed_check) >= IDLE_CLOSED_TIMEOUT)
1101 DEBUG( 2, ( "Closing idle connection\n" ) );
1105 last_idle_closed_check = t;
1107 if (keepalive && (t - last_keepalive_sent_time)>keepalive)
1109 extern struct auth_context *negprot_global_auth_context;
1110 if (!send_keepalive(smbd_server_fd())) {
1111 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1115 /* send a keepalive for a password server or the like.
1116 This is attached to the auth_info created in the
1118 if (negprot_global_auth_context
1119 && negprot_global_auth_context->challenge_set_method
1120 && negprot_global_auth_context->challenge_set_method->send_keepalive) {
1121 negprot_global_auth_context->challenge_set_method->send_keepalive
1122 (&negprot_global_auth_context->challenge_set_method->private_data);
1125 last_keepalive_sent_time = t;
1128 /* check for connection timeouts */
1129 allidle = conn_idle_all(t, deadtime);
1131 if (allidle && conn_num_open()>0) {
1132 DEBUG(2,("Closing idle connection 2.\n"));
1136 if(global_machine_password_needs_changing &&
1137 /* for ADS we need to do a regular ADS password change, not a domain
1139 lp_security() == SEC_DOMAIN)
1141 unsigned char trust_passwd_hash[16];
1145 * We're in domain level security, and the code that
1146 * read the machine password flagged that the machine
1147 * password needs changing.
1151 * First, open the machine password file with an exclusive lock.
1154 if (secrets_lock_trust_account_password(lp_workgroup(), True) == False) {
1155 DEBUG(0,("process: unable to lock the machine account password for \
1156 machine %s in domain %s.\n", global_myname(), lp_workgroup() ));
1160 if(!secrets_fetch_trust_account_password(lp_workgroup(), trust_passwd_hash, &lct)) {
1161 DEBUG(0,("process: unable to read the machine account password for \
1162 machine %s in domain %s.\n", global_myname(), lp_workgroup() ));
1163 secrets_lock_trust_account_password(lp_workgroup(), False);
1168 * Make sure someone else hasn't already done this.
1171 if(t < lct + lp_machine_password_timeout()) {
1172 global_machine_password_needs_changing = False;
1173 secrets_lock_trust_account_password(lp_workgroup(), False);
1177 /* always just contact the PDC here */
1179 change_trust_account_password( lp_workgroup(), NULL);
1180 global_machine_password_needs_changing = False;
1181 secrets_lock_trust_account_password(lp_workgroup(), False);
1185 * Check to see if we have any blocking locks
1186 * outstanding on the queue.
1188 process_blocking_lock_queue(t);
1191 * Check to see if we have any change notifies
1192 * outstanding on the queue.
1194 process_pending_change_notify_queue(t);
1197 * Now we are root, check if the log files need pruning.
1198 * Force a log file check.
1200 force_check_log_size();
1203 /* Send any queued printer notify message to interested smbd's. */
1205 print_notify_send_messages();
1208 * Modify the select timeout depending upon
1209 * what we have remaining in our queues.
1212 *select_timeout = setup_select_timeout();
1217 /****************************************************************************
1218 process commands from the client
1219 ****************************************************************************/
1221 void smbd_process(void)
1223 extern int smb_echo_count;
1224 time_t last_timeout_processing_time = time(NULL);
1225 unsigned int num_smbs = 0;
1227 InBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1228 OutBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1229 if ((InBuffer == NULL) || (OutBuffer == NULL))
1232 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1235 int deadtime = lp_deadtime()*60;
1236 int select_timeout = setup_select_timeout();
1240 deadtime = DEFAULT_SMBD_TIMEOUT;
1244 /* free up temporary memory */
1246 main_loop_talloc_free();
1248 while (!receive_message_or_smb(InBuffer,BUFFER_SIZE+LARGE_WRITEX_HDR_SIZE,select_timeout)) {
1249 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1251 num_smbs = 0; /* Reset smb counter. */
1255 * Ensure we do timeout processing if the SMB we just got was
1256 * only an echo request. This allows us to set the select
1257 * timeout in 'receive_message_or_smb()' to any value we like
1258 * without worrying that the client will send echo requests
1259 * faster than the select timeout, thus starving out the
1260 * essential processing (change notify, blocking locks) that
1261 * the timeout code does. JRA.
1263 num_echos = smb_echo_count;
1265 process_smb(InBuffer, OutBuffer);
1267 if (smb_echo_count != num_echos) {
1268 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1270 num_smbs = 0; /* Reset smb counter. */
1276 * If we are getting smb requests in a constant stream
1277 * with no echos, make sure we attempt timeout processing
1278 * every select_timeout milliseconds - but only check for this
1279 * every 200 smb requests.
1282 if ((num_smbs % 200) == 0) {
1283 time_t new_check_time = time(NULL);
1284 if(new_check_time - last_timeout_processing_time >= (select_timeout/1000)) {
1285 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1287 num_smbs = 0; /* Reset smb counter. */
1288 last_timeout_processing_time = new_check_time; /* Reset time. */